I have a 12 year old system. 16x 235w panels in a single string on these optimisers. Into a TIGO controller. On 24th Ec three panels stopped working. TIGO say optimisers are faulty. That the new TS4 is a replacement. However, I am told that unplugging and replugging often solves the problem. I tried unplugging one and then replugged, but no luck. Is there a knack to this or any solutions before I try a replace a unit.
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